ci: Test Emacs 30.1 #20

Job	Run time
test (ubuntu-latest, 27.2, false)	1m 4s
test (ubuntu-latest, 28.2, false)	46s
test (ubuntu-latest, 29.4, false)	3m 39s
test (ubuntu-latest, 30.1, false)	3m 46s
test (macos-latest, 28.2, false)	1m 58s
test (macos-latest, 29.4, false)	6m 6s
test (macos-latest, 30.1, false)	9m 20s
test (windows-latest, 27.2, false)	6m 28s
test (windows-latest, 28.2, false)	13m 13s
test (windows-latest, 29.4, false)	7m 9s
test (windows-latest, 30.1, false)	27m 18s
test (ubuntu-latest, snapshot, true)	41s
test (macos-latest, snapshot, true)	1m 43s
test (windows-latest, snapshot, true)	6m 58s
	1h 30m 9s

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